Scraper for paper-calendering rolls or the like.



J. A. FROSSARD.

SCRAPER FOR PAPER CALENDERING ROLLS 0R TIIE LIKE.

APPLICATION FILED APR. 15. I918.v

1,29,93, Patented Apr. 8,1919.

JOHN A. FROSSARD,-

EAST EEYTERELL, MASSACHUSETTS.

SCRAPER FOR PAPER-CALENDERING ROLLS OR. THE LIKE.

Specification of Letters Patent.

Application filed April 16, 1918. Serial No. 228,954.

To all whom it may concern:

Be it known that I, JOHN A. FRossARD, a citizen of the United States, residing at East Pepperell, in the county of Middlesex and State of Massachusetts, have invented new and useful Improvements in Scrapers for Paper-Calendering Rolls or the like, of which the following is a specification.

This invention relates to improvements in scrapers, sometimes called doctors, for paper calendering machines or the like.

The object of the invention is to provide a scraper of simple construction adapted to be applied to various types of calendering machines and having means for adjusting the scraper at points uniformly spaced throughout the length thereof so as to provide a uniform pressure, thus preventing any injury to the roll by scoring or otherwlse.

Another object of the invention is to provide means for applying a variable tension to said scraper against the calendering roll in such a manner that the pressure throughout the length of said scraper will be uniform.

The invention consists in the combination and arrangement of parts set forth in the following specification and particularly pointed out 1n the claims.

Referring to the drawings:

Figure 1 is a plan view of a device embodying my invention shown in connection with a calendering roll, the side frames of the machine being shown in section and portions af the scraper and its supporting means being broken away to save space in the drawings.

Fig. 2 is a vertical section taken on the line 22 of Fig. 1.

Fig. 3 is a vertical section taken on the Y .1 line 33 of Fig. 1, illustrating the'tension regulating means.

Like numerals refer to like parts throughout the several views of the drawings.

In the drawings, 1 and 2 indicate a-pair of calendering rolls of a paper calendering machine embodying the usual side frames 3 and 4;, which side frames serve as guides for journal boxes 5 and 6 within which the rolls 1 and 2 are j ournaled to rotate.

In machines of this character, the paper is fed through the rolls thereof at a very high rate of speed and during its passage,

:the surfaces of the paper are calendered and it is therefore essential that the surfaces of the rolls be kept very smooth and clean, otherwise the marks would show upon the paper.

To keep the rolls clean, scrapers have been used more or less extensively, said scrapers being often called doctors which are yieldingly maintained in contact with the surfaces of said rolls and scrape therefrom any portions of the paper which may adhere thereto.

Furthermore, these scrapers or doctors are of great advantage in starting the paper through the rolls for unless some such device is employed, the .ends will sometimes stick to the rolls and owing to the speed at which the rolls are turning a. large Patented Apr. 8, 191$.

amount of paper will be wound about the I rolls before the same can be stopped. This amount will, therefore, be wasted. Y

In the present case, a scraper is em tance back of the contacting portions of said rolls. This blade is preferably secured between two parallel strips of metal 8 and 9 which are held togetherv by screws 10 and constitute a holder for said blade. Said strips 8 and 9 are separated at the rear edges by a narrow strip 11 inserted therebetween which is preferably equal in thickness to the blade 7 so that the forward edges of said strips will lie parallel against opposite faces of said blade and securely hold the same therebetween, said blade being inserted between said strips as far as the screws 10 will permit.

A supporting bar, preferably an angle bar 12, is disposed parallel with the rolls 1 and 2 and at the rear of the scraper blade 7. A leg 13 of said angle bar is directed toward the contacting portions of the rolls 1 and 2 while the other leg 14 of said angle bar is directed downwardly. This bar has secured at opposite ends, studs 15 which constitute pivots for said bar and permit the same to be rocked slightly relatively to the roll. V

Interposed between the holder for the scraper 7 and the leg 13 of said bar are a plurality of supporting elements 16 arranged at substantially equal distances apart throughout the length of the scraper, and these supporting elements are preferably narrow strips of steel which are preferably riveted to the end strip 9 of said holder by rivets 17. These supporting elements are attached to the le 13 of said angle bar in such a way that a imited pivotal movement thereof willbe iermitted in a plane disposed substantial y at right angles to the axes of the rolls 1 and 2.

This is accomplished preferably by securing the supporting'elements 16 to the forward edge of the leg 13 of said angle bar by means of screws 18, said supporting elejments extending beyond said screws where they are each engaged by a set screw 19 having screw threaded engagement with the angle bar 12, and by moving the screw 19 downwardly the supporting element engaged thereby may be rocked about the screw 18 which constitutes the fulcrum the scraper any point in the length thereof. The angle bar 12 is adjustably mounted relatively to said roll to move either vertically or horizontally toward and from the roll 1.

To accomplish this result, a pair of slides 20 are arranged in brackets 21 transversely of which said slides are adapted to move toward or from the roll 1. The brackets 21 are, in turn, mounted upon .parallelly disposed guide members 22, 22 secured to the.

side frames 3 and 4. The parallelly disposed members are disposed vertically upon the frames 3'and 4: and are separted from said frames by separators 23 which provide sufiicient room between said members 22 and said frames for the heads 24 of screws 24 which are arranged between the parallel members 22 and secure the brackets 21 to said parallel members.

A plurality of sets of holes 25 are provided in the brackets 21 so that said brackets may be moved transversely of said parallel members to vary the positions thereof relatively to the rolls 1 and 2. The brackets 21 have grooves 26, within which the'slides 20 are arranged to assist in positioning'said slides upon said brackets. \A screw 27 is provided for each of said slides by means of which said slides may. be secured to their respective brackets.

It is desirable that means be provided for applying a yielding pressure to the scraper 7, and this pressure is preferably accomplished, in the present instance, by means including a torsional spring 28 constructed in the form-of an angle bar and secured at a plurality of points by screws 29 to the rear spring tosaid supporting member while the spring 28, the latch 3 may be released and of the angle bar or supporting member 12, said spring being disposed'longitudinally of said bar.

The screws 29 secure one end of said opposite end is free to be deflected relatively to the angle bar 12 and the deflecting action thereof'a'pplies' the necessary pressure to the scraper 7. To deflect said spring, a lever 30 is provided, said lever being pivotally mounted upon the stud 15 adjacent to the free end of said spring, and this lever has a slot 31 formed therein to receive a stud 32 secured to the free end of said spring.

Means are provided for holding the lever '80 3,0 in the desired positions .to maintain said spring-under tension, said means preferably including a latch 33 pivoted at 34 to the free end ofsaid lever 30.. The latch 33 moves upon its pivot between lugs 35 On said lever which withstand a greater portion of the pressure exerted thereon by said spring. This latch is adapted to engage suitably positioned lugs 36 formed upon the slide 20 adjacent thereto by a spring 37 which forces the free end of said latch outwardly from said lever into alinement with one of said lu s 36.

o operate'the lever 30 to vary the tension on the scraper 7, the latch 33 is pressed toward the handle of the lever 30, thus disengaging said latch from the lug 36 and de- 'flecting the spring 37, and after said lever has beenrocked about the pivoted stud 15 to accomplish the desired deflection of the will be forced outwardly in contact with one or the other of the lugs 36, thus retaining saidlever in the desired position.

Having thus specifically described my invention what I claim and-desire by Letters Patent to secure is:

1. In combination, a roll, a scraper extending substantially the length thereof arranged in contact with said roll, a supporting member for said scraper, and disposed substantially parallel with said roll, and means interposed between said scraper and said supporting member at predetermined distances apart throughout the length of said scraper, adapted to support said scraper.

2. In combination, a roll, a scraper arranged with one edge in contact with said. roll, an angle bar disposed substantially parallel with said roll with one of the legs thereof directed toward said roll, a plurality of supporting elements interposed between said scraper and said angle bar, and means for adjusting said supporting elements relatively to the leg of said angle bar directed toward said roll.

3. In combination, a calendering roll, a resilient scraper arranged in contact with said roll, an angle bar dlsposed substantially parallel with said roll, one of the legs thereof directed toward said roll, a plurality of blade supporting elements mounted upon the leg of said angle bar directed toward said roll, said supporting elements being arranged to rock in a plane at right angles to the axis of said roll, and means for moving said supporting elements independently of each other relatively to said vangle bar.

4:. In combination, a roll, a scraper arranged in contact with said roll, a supporting member pivotally disposed substantially parallel with said roll, a plurality of'relatively movable supporting elements interposed between said scraper and said supporting member, means for rocking said supporting member upon its pivot to apply pressure to said scraper, and a torsional spring interposed between said' supporting member and its operating means.

5. In combination, a roll, a scraper adaptedto engage said roll, a supporting member for said scraper pivotally disposed 'in substantially parallel relation to said roll, a torsional spring secured at one end thereof to said supporting member, a lever pivotally mounted to rock about the axisof-said supporting member, said lever having engagement with the other end of said spring, adapted to be rocked relatively to said supporting member to deflect said spring, and means for locking said lever in various positions relatively to said supporting member.

6. Incombination, a roll, a scraper adapted to engage said roll, a supporting member for said scraper pivotally disposed in substantially parallel relation to said roll,

relatively adjustable supporting elements interposed between said supporting member and said scraper disposed at uniform distances apart throughout the length of said scraper, a torsional spring attached to said supporting member, and means engaging said torsional spring adapted to defleet the same and to apply a variable pressure through said supporting elements to said scraper.

7. In combination, a pair of paper calendering rolls, a resilient scraper arranged in contact with one of said rolls, a supporting member for said scraper including an angle bar disposed with one leg thereof directed toward said rolls, the other leg of said angle bar extending downwardly, means for connecting said scraper with said first mentioned leg, and a reinforcing block secured to said other leg adapted to be engaged by paper which is being fed between said rolls and direct .said paper downwardly therefrom.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

, JOHN A. FROSSARD. Witnesses:

SYDNEY E. TAFT, HATTIE E. STRA'I'ION. 

